Machine for manufacturing sheet-metal pipe.



F. MAGIDSON.

MACHINE FOR MAN UFAOTUEING SHEET METAL PIPE.

' APPLICATION TILED FEB.1,1911. I 1 ,023, 1 1 5. Patented Apr. 9, 1912.

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F. MAGIDSQN. MACHINE FOR MANUFACTURING SHEET METAL PIPE.

A APPLICATION FILED FEB-.1, 1911. I 1,023, 1 1 5. Patented Apr. 9, 1912.

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F. MAGIDSON MACHINE FOR MANUFACTURING SHEET METAL PIPE.

APVPLIOATION FILED mum, 1911. Pa APR 9, 9 12;

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P. MAGIDSON.

1,023,1 1 5. Patented Apr. 9, 1912.

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F. MAGIDSON. MACHINE FOR MANUFACTURING SHEET METAL PIPE.

APPLICATION FILED THE 1, 1911 1 023 1 1 5 Patented Apr. 9, 1912.

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INVENTOR COLUMBIA PLANOGRAPII 00,, WNW, D. C.

F. MAGIDSON.

momma FOR MANUFACTURING SHEET METAL PIPE.

APPLICATION FILED FEB. 1, ,1911. 1,023,1 1 5, Patented Apr. 9, 1912.

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COLUMBIA PMNOGRAPH CO-HNASHINUTON, DTC.

F. MAGIDSON.

MACHINE FOR MANUFAGTURING SHEET METAL PIPE.

APPLICATION FILED THE. 1, 1911. 1,023,1 15. Patented Apr.9,1912.

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INVENTOR COLUMBIA PLANOURAPH (10.. WASHINGTON, D. c.

TJ'NTTED STATES PATENT onrrcn.

FRANK MAGIDSON, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO ROYAL AUTOMATIC MACHINE COMPANY.

MACHINE FOR MANUFACTURING SHEET-METAL PIPE.

Application filed February 1, 1911.

To all whom it may concern:

Be it known that I, FRANK MAGIDSON, a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Machines for Manufacturing Sheet-Metal Pipe, of which the following is a specification.

This invention relates to a machine for the manufacture of sheet metal pipe having lapped and riveted seams, being designed primarily for the manufacture of stove pipe.

The primary object of the invention is to provide an automatic machine from which flat plates are delivered in the form of riveted pipe joints or sections which are ready for use. For the accomplishment of this object the machine embodies mechanism for curling or shaping the sheet into blank form, and mechanism for riveting the seam formed by the overlapping edges of the blank.

While the foregoing is a general statement of the purpose and operation of the machine, various subordinate objects have been in View and are accomplished in the perfected machine. Starting at the beginning of the successive manipulations to which the blank is subjected, some of these objects arethe crimping and beading of r the blank while it is being curled; the delivery of the blank from the curling mechanism with its longitudinal edges properly lapped for riveting; eflicient intermittently operating riveting mechanism which includes means for punching the rivet holes, rivet up-setting means and means for shaping the upset rivets; improved means operating intermittently and alternately with the riveting mechanism for moving the curled blank in position to be riveted and for removing the same at the completion of the riveting operation; eflicient means operating in advance of the riveting mechanism for clamping the blank and securely holding it during the riveting operation, said means releasing its hold after the riveting is completed; and improved means for holding and projecting the rivets which is operative preceding and during the rivet upsetting operation.

In addition to the foregoing, the invention includes the novel assemblage of the several parts of the machine and their operating elements which are so arranged and Specification of Letters Patent.

Patented Apr. 9, 1912.

Serial No. 605,389.

their operations so timed that all of the work is performed automatically and with mechanical precision.

In the accompanying drawings, Figure 1 is a view in top plan of the machine, a portion. of the sheet-feeding hopper being broken away. Fig. 2 is an elevation of the power-end of the machine; Fig. 3 is a vertical cross section on line 33 of Fig. 1; Fig. 4 is a similar section on line 44 of Figs. 1 and 16; and Fig. 5 an elevation of the opposite end of the machine from that shown in Fig. 2, Figs. 2, 3, 4: and 5 illustrating the positions of the several parts just prior to a sheet entering the curling rolls. Fig. 6 is a side elevation of the blank forming portion of the machine. Fig. 7 is an elevation of the opposite side of the curling rolls from that shown in Fig. 6. Figs. 8, 9 and 10 are cross sections illustrating the curling mechanism, taken on lines 88, 99 and 1010, respectively, of Fig. 7. Fig. 11 is a sectional detail of the holder which receives the blank from the curling means. Fig. 12 is a face view of the blank clamping mechanism mounted on the blank moving carriage, and Fig. 13 is an edge view of the same. Fig. 14 is a top plan of a portion of the machine illustrated in Fig. 6, parts thereof being broken away, and other parts shown in sec tion. Fig. 15 is an elevation of the carriage operating gearing. Fig. 16 is a central longitudinal sect-ion of that portion of the machine containing the riveting mechanism, the hammer means being shown in elevation; and Fig. 17 is an elevation of a portion of the machine and a portion of the hammer mechanism, illustrating the parts for controlling the movement of the hammer mechanism. Figs. 18 and 19 are details illustrating the mechanism for stretching the blank and clamping it in position for riveting. Fig. 20 is a detail of the riveting hammer. Fig. 21 is a diagrammatic View illustrating the four posit-ions of the hammer mechanism with relation to the rivet being operated upon, these positions being taken successively by the hammer 1necha nism during one cycle of its operation. Fig. 22 is a diagrammatic View of the face of the cam wheel which operates the hammer mechanism, and Fig. 23 is a face View of said wheel.

Referring to the drawings, the entire machine is built upon and supported by the three upright leg-forming frames 2, 3 and 4 which are connected together by the horizontal parallel rods 5. The blank forming mechanism is located between frames 2 and 3, and the riveting mechanism between frames 3 and 4. The initial driving mechanism is at what I shall term the front end of the machine and is supported by frame 2, the same consisting in part of the transverse drive shaft 6 and driving pulleys 7 The worm gear 8 on shaft 6 meshes with the larger gear wheel 9 carried by shaft 10, the latter extending longitudinally of the machine from end to end and actuating a number of the moving parts, its movement being relatively slow as will. be understood from the manner in which it is geared to the drive shaft 6.

The blank curling or forming mechanism is fully illustrated in Figs. 1, 3 and 6 to 11, inclusive. The same consists of three parallel rolls'll, 12 and 13. The blank forming fiat plates are received one by one from hopper 14, the plate entering-between the initial rolls 11 and 12 and being curled into blankform by the coaction of these rolls and roll 13, as clearly shown in Fig. 8, roll 13 being adjustable for curling the blank B to larger or smaller diameter in manner well known in this class of devices for shaping pipe blanks from fiat plates.

Beneath the blank curling rolls is the longitudinal blank holder 15 which is formed at the lower end of the supporting member 16 which may be hooked over bar 17 of the frame. Support 15 is bent or otherwise formed to provide longitudinal groove 18 and similar opposite groove 19, the latter underlapping groove 18, as clearly shown in Fig. 11. As the blank emerges from the rolls it curls upward somewhat as indicated in dotted lines in Fig. 8 and its advancing edge springs into groove 18, and when the blank fully emerges its rear edge springs into groove 19. The blank is thus supported with its edges overlapped in proper relation for riveting, the blank remaining on the support until moved longitudinally by the carriage or blank moving mechanism, the motion of which is so timed as to begin as soon as the blank has been fully formed. The support 15 permits of free longitudinal movement of the blank thereon so that the latter may freely slide therefrom as the carriage advances, as indicated in dotted lines in Fig. 6.

A novel feature of the blank forming mechanism is the provision of means for crimping an end of the blank, as indicated at C, so that it may readily fit within another section of pipe, also beading the blank at D at the base of the crimp to form a stop, as is usual in stovepipe. The crimp O is formed by the crimping extremities 20 of rolls 11 and 12, and the bead is formedby the corresponding formation 21 on the same rolls, all as clearly shown in Fig. 7. Thus each blank is curled into blank form and is crimped and beaded, all at one and the same time, and not by separate operations as has been the practice heretofore.

The rolls 11 and 12 are geared together as indicated at 22, Figs. 7 and 10, and roll 12 is geared to roll 13 as shown at 23, Fig. 10. The spindle of roll 11 is extended at 24, Fig. 7 for driving the curling rolls intermittently in the manner presently to be explained.

The mechanism for moving the blank from support 15 to the riveting mechanism and for retracting the riveted pipe consists primarily of frame or carriage 25 which slides longitudinally of the machine on rods 5, the position of the carriage at the completion of the blank forming operation being at the lefthand end of its travel, as shown in full. lines in Fig. 6, from which position it advances as indicated in, dotted lines in the same figure until it reaches the position shown in Fig. 14. The carriage is actuated by a crank 26 mounted to turn thereon, which crank is secured to an endless drive chain 27 which is actuated tomove the car riage intermittently in reverse directions,

as will presently be described.

Secured to the end face of carriage 25 which advances toward the riveting mechanism is the vertical plate 28 which engages the end of the blank B and slides the latter longitudinally on. support 15 and onto extremity 29 of the hollow mandrel 30 on which the blank is clamped while being riveted. When the blank is fully advanced for riveting, it and the carriage 25 are in the position shown in Figs. 14 and 15, extremity 29 of the mandrel being braced by the supporting bar 31 which is secured to and moves with the carriage and takes position between mandrel extremity 29and the cross web 3 of frame 3 when the blank is fully advanced as in Figs. 14 and 15.

Plate 28 pushes on the extremity of the blank when advancing the same so that no blank-clamping action is necessary. However, on the return movement of carriage 25, which accomplishes the withdrawal of the riveted pipe from mandrel 30, it is necessary to grip the pipe, and this is accomplished by the mechanism shown in Figs. 14 and 15 and in detail in Figs. 12 and.13. Secured to the rear of plate 28 are brackets 32, to each of which is pivoted a pair of horizontal jaws 33 which project through plate 28 on the inner and outer sides of blank B, as in Fig. 14, the jaws of each pair being normally separated by a spring 33, Fig. 13. Slidable vertically on the rear of plate 28 is the T-frame 34, held normally depressed by spring 35. In the top edge of frame 34 are the downwardly tapering depressions 36 which, when frame 34 is raised, embrace and contract jaws 33 into clamping engagement with the edge of blank 13, and so hold the jaws as long as the frame is elevated.

hen the parts are in the posit-ion shown in Figs. 14 and 15, depending portion 34 of frame 34 is in line vertically with pin 37 which moves through web 3 of frame 3, Figs. .15 and 16, said pin being carried by pivoted arm 38 which is held normally depressed on a collar 39 on shaft 10 by spring 37. At the proper interval a pin 39, Fig. 4, projecting from collar 39 raises arm 38 and rod 37, thereby lifting frame 34 and contracting jaws 33 as above described, and when frame 34 is thus raised the spring latch 40 carried by it has a notch which engages a pin 41 projecting from plate 28, thereby holding the frame elevated with depressions 36 looking the jaws in contracted blank gripping position. This hold is maintained until the carriage 25 reaches the backward limit of its movement when a projection 40' on the lower extremity of latch 40 engages and is deflected by the fixed upright 42, Figs. 3 and 6, permitting spring 35 to retract frame 34 as in Fig. 12, whereupon jaws 33 are opened by their springs 33, Fig. 13, and the riveted pipe is released and permitted to roll down over discharging guides 43.

Before proceeding with a description of the construction and operation of the riveting mechanism I will describe the mechanisms for intermittently operating the blank forming mechanism and the reciprocating blank moving carriage.

For the blank forming or curling mechanism, spindle 24, Figs. 6, 7 and 14 is geared by chain 44 to stub shaft 45 and the latter in turn is geared by chain 45 to shaft 46. Shaft 46 extends longitudinally of the machine from end to end, being journaled in suitable bearings on the frames 2, 3 and'4, with its forward end geared to the transverse drive shaft 6, Figs. 1, 2 and 6. Chain 45 operates on sprocket 46 which is normally loose on shaft 46, so that the mechanism for driving the forming or curling rolls operates only when sprocket 46 is secured to shaft 46 by the sliding clutch 47, and this clutch is held normally disengaged by lever 48 acting under the pulley of spring 43. As it is desired that the blank forming or curling mechanism shall operate only when the carriage is in retracted position, as in Fig. 1, the carriage is utilized for throwing clutch 47 into engagement with sprockets 46, this being accomplished by the arm 49 projecting from the carriage which engages lever 43, see Figs. 1 and 6. By this means the operation of the curling mechanism is insured all the while the carriage is in retracted position, and its operation is certainly stopped when the carriage begins to advance to move the curled blank into position for riveting.

Referring tothe mechanism for reciprocating carriage 25, heretofore briefly mentioned in connection wt-h crank 26 and drive chain 27 it will be seen by referring to Figs. 14 and 15 that said chain extends longitudinally of the blank-forming portion of the machine, being actuated by sprocket 50 on short shaft 51, said shaft carrying a larger sprocket 50 with a chain extending from the latter to a sprocket 52 which is loose on shaft 6, said sprocket being engaged and disengaged on the shaft by clutch 52 which is operated by arm 53, the latter pivoted to the frame and holding the clutch normally retracted under the pull of spring 53. A finger 54 projects from arm 53 into the path of two pins 55 and 55, spaced apart on the large gear wheel 9, Fig. 2, these pins operating successively to throw the clutch at times when the movement of the latter is unobstructed by spring latch 56, Figs. 14 and 15, the latch being moved to and held in unobstructing position during difierent periods of the operation by projections 57 and 57 on chain 27. When carriage 25 is fully retracted the positions of projections 57 and 57 is the reverse of that shown in Fig. 15, at such time projection 57 engaging and so tipping the spring latch 56 as to release the clutch and permit the latter to be thrown out by spring 53. The mechanism instantly comes to a standstill with latch 56 held out of clutch obstructing position by projection 57, exactly as it is so held by proreaches the limit of its advancing movement. \Vhen pin 55, Fig. 2, engages finger 54 and so swings arm 53 as to throw the clutch inward, latch 56 is at that moment being held tipped from clutch obstructing position. Motion is then immediately imparted to chain 27, and before the slowly moving pin 55 clears finger 54, projection 57 is disengaged from spring latch 56 and the latter assumes the position shown in dot-ted lines in Fig. 15, and the clutch is thereby held in gear until projection 57 again tips the spring latch, as shown in full lines in Fig. 15, when the clutch is retracted by spring 53 and the carriage mechanism comes to a standstill and so remains during the entire riveting operation. Meanwhile pin 55 has moved past finger 54 and by the time the latter is reached by pin 55 the riveting operation has been completed, and the carriage is ready to return to its initial position, carrying with it the riveted pipe. The clutch 52 being again thrown in by pin 55, chain 27 is started and projection 57 removed from spring latch 56 and the clutch is locked and so remains until projection 57 passes around and tips the latch, thereby releasing the clutch and again bringing the carriage mechanism to a standstill. As before indicated, the return of the carriage to its initial position starts the blank curling or forming mechanism, and carriage 25 remains retracted all the while the forming mechanism is in operation and until a blank is again delivered to holder 15, as shown in Fig. 8. By this time pin 55 on wheel 9 again throws clutch 52 and the blank is advanced to the riveting mechanism, as above described.

The riveting operation proceeds whenthe carriage 25 is in the position indicated in Figs. 14 and 15, with mandrel extremity 29 reinforced from beneath by the support 31. The blank as thus advanced by the carriage is then in position on the mandrel and blank supporting mechanism, as indicated in Fig. 16, with the opposite extremities of the blank embracing the tapered ring-like forms 58 having their top portions flush with the longitudinal anvil bar 59 of mandrel 30,

with the blank seam to be riveted resting on the .anvil, Figs. 18 and 19.

Each of forms 58 is provided with a clamping mechanism for tightly engaging the blank with the form and for maintaining that engagement during the riveting operation. Each of these clamping mechanisms consists of two oppositely mounted levers 6O fulcruined between their ends at 60' to the frame, with the upper ends of the levers carrying the inwardly extending pivoted arms 61, upward movement of these arms being opposed by springs 61 which latter normally hold the inner extremities of arms 61 slightly below the top plane of forms 58 and anvil 59. A flexible blank embracing band 62 has its ends connected to the extremities of arms 61, so that when the upper portions of levers 60 are moved to ward each other by cam mechanism operating on their lower ends, as will presently be described, the spring-held arms 61 are moved into engagement with the blank and ride upwardly thereon, as shown in Figs. 18 and 19, thereby producing an ironing or stretching action and at the same time clamping the blank to the form by the flexible band 62. By this means the blank is brought to exact gage and is permanently so held during the riveting operation.

For operating the clamping levers 60, the portions thereof beneath fulc-rums 60 are acted on by the reversely arranged cams 63 on shaft 10 which move the levers into blank-clamping position against the pull of spring 64, the cams being so surfaced and their operation so timed as to hold the levers in clamping position throughout the riveting operation and releasing them at the completion thereof.

A characteristic of the machine is the facility with which it may be adapted to pipes of different size, it being only necessary to change forms 58 and bands 62 to correspond with the size of pipe to be made.

I will now proceed with the description of the rivet projecting mechanism and the hammer mechanism, both of which coiiperate with the anvil 59. Referring first to the rivet holding and projecting means, anvil 59 is provided at suitable intervals with the rivet-holding passages 59 in which the loose rivets have a movable fit, with their headed ends resting on the spring depressed pins or followers 65, each provided with a cross piece 66 within the tubular mandrel 30 adapted to be acted upon by one of the wedging faces 67 of bar 67, the latter movable longitudinally in the mandrel by means of arm 68, to which is connected a spring 69 for moving said bar in one direction as in raising the spring-depressed pins or followers to raise the rivets, with the arm 68 and bar 67 moved in the opposite direction and so held against the pull of spring 69 by cam 70 on shaft 10. This cam is so shaped and its operation so timed as to permit arm 68 to respond to the pull of spring 69 and project the rivets and hold them projected during that interval in the riveting operation when they should be so projected and held, and for retracting bar 67 when the projected position of pins 65 is no longer necessary. An inward offset 70 in cam 70 permits of the momentarily inward movement of lever 68, the resulting projection of pins 65 being for clearing the openings 59 of any imperfect rivets or fragments of metal that may have become lodged therein so that said openings are entirely clear for the next operation. The rivets R may be placed in openings 59 by hand or by any suitable mechanism provided for that purpose.

The hammer mechanism consists of the elongated hammer bar 71 carried by arms 71 projecting from rock shaft 72, the latter mounted in suitable bearings on frames 3 and 4. Anvil 59 is in the arc of travel of hammer 71, as will be understood. The force for the hammer blows is derived primarily from spring 72 coiled on shaft 72 and so fastened thereto and to collar 73, the

latter having a tail-piece 78 engaging one of rods 5, that the raising or upward movement of hammer 71 is opposed and the hammer when free lowers with much force for accomplishing its working blows.

Rock shaft 72 is oscillated and the ham mer raised or retracted by the gear segment 74 carried thereby and meshing at the proper time intervals with a similar gear segment 75, mounted on the continuously rotated shaft 46, the segments being of such size as to clear each other when the hammer has been fully raised, which occurs when segment 74 is in the full line position shown in Fig. 5, when the hammer is free to respond to the blow-imparting action of spring 72, this excepting at the completion of the hammer operation when the hammer is held retracted by the engagement of a dog 76 on shaft 72 with latch 76, Figs. 1 and 17 on one of guides 5. The operation of engaging and disengaging this dog and latch will be presently described.

The operating face of hammer bar 71 is provided with three separate formations for operating seccessively on each rivet, and these formations are brought into register with the rivets by moving rock shaft 72 longitudinally of its bearings, this being accomplished by the lever 77 fulcrumed between its ends to frame 3, with its yoke-like upper end 77 'embracing a grooved collar fixed to shaft 72, and with springs 78 connected to the lower portion of the lever for throwing it in one direction and a cam 79, operating on the same portion of the lever, for moving it in opposition to springs 78. This mechanism is fully illustrated in Figs. 4, 17, 20 and 21.

Referring to Figs. 20 and 21, the three operating portions of hammer bar 71 for each rivet consist of a punching cavity a, a rivet upsetting depression I) and a depression 0 for giving final shape to the upset end of the rivet. The hammer is first brought into action with cavity a in line with the rivet, so that the latter is punched through the two thicknesses of the pipe joint by two or more blows imparted while the rivet is being projected by wedge 67 The next movement so shifts the hammer as to place the upsetting surface 6 in line with the rivet, and after the necessary number of blows are struck the hammer is again shifted to place the finishing depression 0 in register which rounds and finishes the upset end of the rivet.

The several positions of the hammer and anvil are shown diagrammatically in Fig. 21 in connection with cam 79, the latter being shown flattened in Fig. 22 to more clearly illustrate the several movements. When the parts are at rest, as when the hammer is inactive and held raised by'dog 76, the position of the parts is as shown in part V of Fig. 21; for punching it is as shown at part WV; for upsetting at part X, and for finishing the upset rivet at part Y.

Cam 79 is mounted on spindle 79 projecting from frame 3, Fig. 17, and is turned by the star-shaped wheel 80 secured to the back of the cam. The mechanism which 00- operates with wheel 80 for turning the cam will be presently described.

The face of cam 79 is provided with four surfaces or face portions cl, 6, f and 9, arranged successively in a circular series, as will be understood. When the mechanism is at rest, with dog 76 in engagement with the latch 76, the parts are in the adjustment shown in partV of Fig. 21, with lug h of lever 77 engaging face (Z. When cam wheel 79 is turned sufliciently the deeper face 6 permits lever 77 to respond to the pull of springs 7 8, thereby moving the hammercarrying shaft to the position shown at part W of Fig. 21, with punching cavity a in line with the rivet. And the operation of wedge bar 67 is so timed that when the hammer is thus moved and makes one or more strokes with cavity a alined with the rivet, the latter is projected outwardly so that the blank I) may be punched downwardly thereover. After this has been accomplished, lug h of the shifting lever encounters the longer face f of the cam wheel which so shifts the parts that the riveting portion 7) of the hammer face is alined with the rivet, and the hammer is caused to impart blows one after the other in suflicient number to fully upset the rivet. Following this, lug h neXt encounters surface g of the cam wheel, as indicated in part Y of Fig. 21, which brings the finishing cavity 0 in the hammer face in register with the rivet, and after the hammer strikes one or more blows and suitably shapes the upset extremity of the rivet, a further movement of the cam wheel 79 moves the mechanism into the neutral position V, Fig. 21, when dog 76 is engaged by latch 76, and the movement of cam wheel 79 then ceases until the hammer mechanism is brought into position for acting on the next blank, in the meantime the sect-ion of pipe previously riveted is withdrawn by carriage 25 and a new blank is curled and passed to position on the riveting mechanism.

The cam actuating star-wheel '80 is moved intermittently by the finger or wiper 81 on shaft 46, the teeth of wheel 80 being so spaced, with one exception, that each turn thereof places another tooth in the path of said wiper, and by this means the cam wheel is moved progressively and the surfaces cl, 6, f and 9 thereof move successively past lug it until in the final position surface cl is presented to the lug, at which time the parts are in the non-operating position indicated at V, Fig. 21, with the hammer held elevated by. dog 76. When this position is reached the exception in the continuous step-by-step movement of starwheel 80, above referred to, takes, place which is caused simply bythe omission of a tooth from the wheel, as shown at the left hand side of said wheel, Fig. 4, and in Fig. 28. With this toothless space opposite wiper 81, the latter continues its rotations without effect on the star-wheel, and the step-by-step movement is not resumed until the wheel is turned by other means for placing a tooth of the star-wheel in the path of wiper 81. Such other means consists of a vertically movable arm 82, .Fig.

4, which is retracted by spring 83, said arm being pivotally supported on hanger 84 by a link 85 and a lever 86, the extremity 86 of the latter projecting into the path of pin 87, carried by shaft 10, Figs. 4 and 16, and when this shaft turns sufficiently to engage pin 87 with the extremity of lever 86, arm 82 is raised into engagement with a pin 88 projecting from cam 79 and turns the latter and star-wheel 80 sufliciently to place one of the star-Wheel teeth in the path of wiper 81. This .operation is brought about by pin 87 at the moment when it is desired to bring the hammer mechanism into play, shaft 10 turning slowly, as heretofore explained, so that the desired operation may be accurately timed. After star-wheel 80 is set in operative position as described, it continues to move intermittently and cam wheel '79 effects a full cycle of operations of the hammer mechanism by the time the toothless space of the star wheel is again brought opposite wiper 81 for interrupting the intermittent operation until it is again time for .the hammer mechanism to be operated, as

determined by the movement of pin 87 into engagement with lever 86. And as above indicated this does not take place until the pipe section last riveted is removed and a fresh blank is formed and moved into position and clamped for rivet- 1n While the machine is designed primarily for manufacturing stove pipe, it is not confined thereto. Also, it may be constructed to operate on either longer or shorter pipe lengths than those usually used for stoves.

I claim 1. In a machine sheet-metal pipe, the combination of mechanism for forming a pipe blank from a plate, mechanism for fastening together the longitudinal edges of the blank, a blank moving carriage, and means for moving the carriage in one direction for removing the blank from the forming mechanism to the fastening mechanism and for moving the carriage in the opposite direction for removing the pipe from the fastening mechanlsm.

for manufacturing anism for forming a blank With longitudinal edges which are subsequently fastened together, a holder which said longitudinal edges engage as the blank emerges from the forming mechanism, the holder being shaped to permit the blank to slide longitudinally therefrom, means for thus sliding the blank, and fastening mechanism for receiving the blank as it is moved from the holder.

4. In a machine for manufacturing sheet-metal pipe, the combination of blankforming mechanism, blank riveting mecha nism, a carriage for moving the blank from the forming mechanism to the riveting mechanism and for removing the same from the latter, and mechanism for intermittently moving the carriage only at the completion of the forming and riveting operations.

5. In a machine for manufacturing sheet-metal pipe, the combination of blank forming mechanism, riveting mechanism including a mandrel and a hammer, a reversely movable carriage for placing the blank on the mandrel and for removing the same therefrom, and blank gripping means on the carriage for engaging the blank and causing it to move with the carriage. I

6. In a machine for manufacturing sheet-metal pipe, the combination of riveting mechanism, means for moving a blank to and from the riveting mechanism, an endless drive chain connected to the moving means, power means for the drive chain, means carried by said chain for rendering the power means inactive, and other means operating to render the power means operative.

7 In a machine for manufacturing sheetmetal pipe, the combination of a positively driven shaft, means actuated intermittently by the shaft for riveting a blank, and blank moving means operated intermittently by the shaft with the operations of the moving means timed to alternate with the operations of the riveting mechanism for moving a blank to and from the latter.

8. In a machine for manufacturing sheetmetal pipe, the combination of intermittently operable blank forming mechanism, a reversely and'intermittently movable blank moving carriage,means actuated by the carriage when the latter is at the limit of its movement in one direct-ion for setting the forming mechanism in motion and for stopping such motion when the carriage starts to move in a reverse direction, carriage operating means, and riveting mechanism to which the carriage delivers the blank.

9. In a machine for manufacturing sheetmetal pipe, the combination of blank forming mechanism, gearing for driving the same, a clutch controlling said gearing, a

reversely movable blank moving carriage operating at the limit of its movement in one direction to throw the clutch into operative posit-ion and when starting in the reverse direction operating to release the clutch from operative position, carriage moving means, and blank riveting mechanism to which the carriage delivers the formed blank.

10. In a machine for manufacturing sheetmetal pipe, the combination of a blank moving carriage, means for intermittently moving the carriage in reverse directions, riveting mechanism to which the carriage when moving in one direct-ion delivers the blank, blank gripping means mounted on the carriage, and means operating to release the hold of the gripping means when the carriagc has moved the blank from the riveting mechanism.

11. In a machine for manufacturing sheetmetal pipe, the combination of a blank moving carriage, means for intermittently moving the carriage in reverse directio-ns,'riveting mechanism to which the carriage when moving in one direction delivers the blank, blank gripping means mounted on the carrage, means operating the gripping mechanism and causing it to grip the blank, and means operating to release the hold of the gripping mechanism when the carriage has removed the blank from the riveting mechanism.

12. Pipe riveting mechanism comprising a rivet holding mandrel which is adapted to be embraced by a blank, and movable means operating in one position to project the rivets through the blank and in another position to upset the rivets.

13. Pipe riveting mechanism comprising a rivet holding mandrel which is adapted to be embraced by a blank, a hammer elongated in the direction of the length of the seam to be riveted, hammer operating means, the hammer having depressions one of which is arranged to first register with the rivet for forcing the latter through the blank, and means for changing the relative positions of the mandrel and hammer to place the rivet and the first hammer depressions out of register and for placing other depressions of the hammer in register with the rivet.

14. Pipe riveting mechanism comprising a rivet holding mandrel adapted to be embraced by a blank, a hammer elongated in the direction of the seam to be riveted, the hammer having differently formed surfaces arranged in the direction of its length for variously operating in conjunction with the,

rivets, hammer operating means, and means for moving the hammer longitudinally for placing each of the several rivet operating depressions thereof successively in register with the rivets.

15. Pipe riveting mechanism comprising forms of the transverse interior dimension of the pipe to be riveted, flexible bands for clamping a pipe blank on said forms, band operating means, and riveting mechanism.

16. Pipe riveting mechanism comprising an elongated mandrel, pipe forms in association with the mandrel, means for confining the blank on the'forms and mandrel, and hammer means cooperating with the mandrel.

17. Pipe riveting mechanism comprising pipe forms adapted to receive a pipe blank by endwise movement thereover, means for confining the blank on the forms, and riveting mechanism.

18. Pipe riveting mechanism comprising pipe forms adapted to receive a pipe blank by endwise movement thereover, flexible blank embracing bands, means for engaging and disengaging the bands with the blank, with the latter in position on the forms, and riveting mechanism.

19. Pipe riveting mechanism comprising forms tapered longitudinally and adapted to receive a blank by endwise movement thereov-er, means for clamping the blank to the forms, and riveting mechanism.

20. Pipe riveting mechanism comprising internal forms for a pipe blank adapted to receive a blank by endwise movement thereover, mechanism for moving the blank endwise in position on the forms, means for clamping the positioned blank, and riveting mechanism.

21. In an automatic pipe riveting machine, blank supporting means adapted to sustain the blank while being riveted, intermittently operating riveting mechanism, blank clamping mechanism, and intermittently operating mechanism operating to adjust the clamping mechanism to the blank in advance of the operation of the riveting mechanism and operating to maintain said adjustment throughout the operation of the rivet-ing mechanism and to release the clamping mechanism at the completion of the riveting operation.

22. In an automatic pipe riveting machine, supporting means for sustaining the blank while being riveted, means for clamping a blank -to the support, intermittently operating riveting mechanism, intermittently opcrating mechanism for adjusting the clamping means into blank holding position preceding the operation of the riveting mechanism and maintaining said adjustment while the riveting mechanism is operating and releasing said adjustment at the completion of the riveting mechanism, and intermittently operating blank moving mechanism which completes its blank positioning and blank removing movements, respectively, alternately with the operations of the riveting mechanism.

23. In an automatic pipe riveting machine, a riveting hammer having its hammer face provided wit-h differently formed surfaces for performing different operations on the rivets, means for imparting hammer strokes to the hammer, and automatic means for shifting the position of the hammer relatively to the work for placing its differently formedsurfaces, respectively, in position to operate on the same rivets.

24. In an automatic pipe riveting machine, a riveting hammer formed with riveting punching holes, riveting upsetting sur faces and rivet finishing cavities, means for imparting hammer strokes to the hammer, and automatic means for shifting the position of the hammer relatively to the work for placing the punching holes, upsetting surfaces, and finishing cavities, respectively, in operative relation to the same rivets. 25. In a pipe riveting machine, a support for a pipe blank, opposite pivoted arms movable toward and from each other and adapted to engage the blank at opposite sides of the line of riveting, arm moving means, springs for opposing movement of the arms on their pivots, a flexible blank embracing band having its opposite ends connected to said arms, and riveting mechanism.

26. In a pipe riveting machine, a supportfor a pipe blank, levers at opposite sides of the support, means for moving the levers toward and from each other, blank engaging arms pivoted to the levers, springs for opposing movement of the arms on their pivots, a flexible band having its ends secured to said arms, and riveting mechanism.

27. In a pipe riveting machine, a blank supporting mandrel, a rock shaft parallel with the mandrel, a hammer carried by the shaft and having a plurality of blow-imparting surfaces, means for rocking said shaft, and means for moving the shaft longitudinally to present the several blow-imparting surfaces of the hammer to the rivet being operated upon.

28. In a pipe riveting machine, a blank supporting mandrel, rivet holding means, a longitudinally movable rock shaft parallel ing the mandrel, a hammer carried by the shaft and having a plurality of depressions, a spring actuated lever for moving said shaft and thereby presenting the several depressions of the hammer face to the rivet being operated upon, and a cam wheel operating on said lever in opposition to the spring, said wheel having differently formed portions which successively engage the lever for determining the movement of the same When shifting said shaft.

29. In a pipe riveting machine, a blank supporting mandrel, rivet holding means, an oscillating hammer having a plurality of depressions, mechanism for shifting the hammer relatively to the mandrel for presenting each of said depressions to the rivet being operated upon, means for moving the hammer away from the mandrel, and a spring for accelerating the blow-imparting oscillations of the hammer.

30. In a pipe riveting machine, a blank supporting mandrel, rivet holding means, an oscillating hammer, a cogged segment mounted on the hammer axis, a drive shaft, and a cogged segment on the drive shaft which meshes with the hammer segment for moving the hammer away from the mandrel and adapted to disengage the hammer segment when the hammer is raised.

31. In a pipe riveting machine, a blank supporting mandrel, rivet holding means, a longitudinally movable hammer having a plurality of blow-imparting surfaces, a drive shaft, gearing arranged to intermittently connect the drive shaft and hammer for raising the latter, and mechanism operated by the drive shaft and connected to the hammer for moving the same longitudinally of the mandrel.

32. In a pipe riveting machine, a blank supporting mandrel, rivet holding means, longitudinally movable vertically oscillating hammer, means for holding the hammer raised and inactive while moving a blank relatively to the mandrel, mechanism operating at the beginning of the hammer operation for moving the hammer longitudinally from inactive position and for return ing the same to said position at the completion of the hammering operation, and hammer oscillating means.

In testimony whereof I aflix my signature in presence of two witnesses.

FRANK MAGIDSON.

Witnesses:

J. M. NEsBIT, F. E. GAITHER.

Copies of this patent may be obtained for five cents each by addressing the Commissioner of Patents, Washington, D. G. 

